I would keep communicating. How old are you/is there is DEFINITE line in the sand? i.e. we have until we are 40 to decide.

And until that line, whatever criteria makes sense for you two to make a decision, keep communicating about your desires, hopes, etc.

My personal experience (as a woman) is my own decision has flopped back and forth on a weekly basis since my one baby was born. The fear of missing out is real. Not many people choose 1 baby so there is constant panic that I MUST have a 2nd baby because who has one baby!? That not giving my baby a sibling or trying for a 2nd baby is a disservice.

But my husband has stayed the course firm that hes one and done and its kept me on the OAD course. Reading "One and Only" by Lauren Sandler helped TREMENDOUSLY but I was already very open to OAD when I read it so YMMV if you just hand this book to your wife.

But in reading it, I really believe our baby will be best with 2 parents giving her everything vs. Being stretched thing over multiple kids.